Muffler



R. BROWN.

MUFFLER.

APPLICATION HLED MARA 13. |919.

1,335,872. Patented Apr. 6, 1920.

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UNITED STATES PATENT OFFICE.

ROBERT BROWN,- or 'roLE-Do, OHIO.

MUYFFLER.'

Specification of Letterslatent. v Patented A131', 6, 1920.

.Application filed March 13, 1919.. Serial No. 282,253.

To all whom it may concern Be it known that I, ROBERT BROWN, a citizen of the United States, residing at Toledo,

to provide'a device of this character which embodies novel features of construction the exhaust noises are effectively' whereb silence without producing excessive'back pressure upon the engine. v

F urtherobjects of the invention are to provide an efficient and effective muffler which can bev inexpensively constructed from sheet metal, which can be quickly assembled or taken apart for cleaning, which has a strong and rigid construction welll adapted to withstand the hard usage to which such devices are subject.

Withithese and other objects in View, the invention consists in certain novel combinationsA and arrangements of the parts as will Vmore .fully appear as the description proceeds, the novel features thereof being pointed out inthe appended claims.

For a full understanding of the inven tion, reference is to be had to the following description and accompanying drawings, in which 'Figure 1 is a side elevation of a muflier constructed in accordance with the invention.

Fig. 2 isa longitudinal sectional view through the same.

Fig. 3 is a transverse sectional view.

Fig. 4 is a rear end view of the muffler with portions of the rear end cap broken away.

Corresponding and like parts are referred to in the following description and indicated in all the views of the drawings by the same reference characters.

Referring to the drawings, which illustrate one embodiment of the invention, the numeral 1 designates an elongated tubular outer casing which has a uniform cross section throughout its length and is shown as cylindrical in shape. This outer casing may be conveniently formed by rolling a strip of sheet metal, the longitudinal edges being overlapped and secured in any suitable manner as by means 'of spot welding, as indicated at 2. Extending longitudinally through the center ofthe outer casing 1 and spaced therefrom is aninner tubular shell 3., This inner shell 3 is preferably polygonal in cross section, 'each of the flat faces of the shell being formed of a sheet metal strip 3a 'of which the longitudinal edges are bent outwardly. The'. abutting outwardly bent edges ofyadjacentstrips or plates 3al form i longitudinal' flanges'74l .which project radially-from the innershell and engage the 1 Outer casing 1', 'thereby dividing the space between the shell?) and outer casing l into a series Iof longitudinally extending expansion chambers A. The fianges 4 are thus each formed of two thicknesses of material tting closely againsteach other, and these thicknesses of material may be secured in any suitable manner as by means of the spot welding indicated at'5. l

One of the flanges 4 is imperforate, while all of the. other flanges are provided with openings 6 which lplace the adjacent expansion chambers A in communication with each other. The expansion vchamber A on one side of the imperforate flange 4 communicates with the interior of the inner shell 3 through a series of openings 7 while the expansion chamber A on the opposite side of the imperforate flange communicates with an outlet opening 8 in an end cap 9 which is tted upon therear .end of the outer casing 1. The opposite end of the casing is providedwith an end cap 10 which closes the forward ends of all of the expansion chambers A'and is provided with a central opening 11 adapted to receive the exhaust pipe from the engine. The various sheet metal plates of the inner shell 3 are provided at their forward ends with flanges 3 which fit against the end cap 10 and are rig` Y idly secured thereto in any suitable manner as by means of the spot welding indicated at 12. The inner shell 3 is thus carried by the end cap 10 so that it is removable therewith.

The rear end of the inner shell 3 is pro` vided with a transverse plate 13 which has a polygonal shape corresponding to the cross section of the inner shell, the edges of the plate being formed with flanges 13a which fit against and are secured to the inner walls of the shell 3. A bolt 14 extends through the transverse plate 13 and rear end cap 9, and it Will be obvious that when this bolt is tightened the inner shell 3 will be rigidly connected to both of the end caps so as to be held firmly in position within the outer casing. However', by removing the bolt the rear -end cap .Qecan lbe removed and -thef'inner shell drawn out of the outer casing with the forward end cap l0 attached'tliereto. The parts can thus be readily taken apart or assembled, as may be desired.

The exhaust pipe from the engine may pass through the central Aopening 1.1v ofthe end vcap 10, andthe exhaust gases will :thus

.- enter the interior ofthe inner shell 3. From this comparatively large chamber they will pass through the openings 7 into one ofthe expansion chambers :l located adjacent the imperforate flange a. From this first expansion chamber A the products of combustion will pass .successively through thel this last expansion chamber the xproducts of' combustion will be finally discharged through the opening 8 in the end...cap 9, andl the passage ofv the exhaust'v gases through the various v chambers will .act in a most'effective manner to silence the exhausti The outlet opening v8 'is' shown as orined'iby cutting a lip from the end cap., said -lip, be ing bent outwardly 4as indicated at l5 and being arranged so as to deiect the exhaustgases away from the vehicle or other ma* chine upon which the muiiier is mounted.

Having .thus described the invention,

what 'I claim as newand desire to secure'by Letters Patent, is

1.111 a -muiiier, the combination with ,an elongated tubular casing and removable end caps therefor, of a tubular shell-.extending longitudinally through the casing Aand permanently connected-to one of the endzcaps so as to -be removable therewith, a series of longitudinal flanges projecting radially froinvthe tubular shell and subdividing .the space between the outer casing and inner the lsh'elll'andthe expansion chamber 'onon'esideof the imperforate flange, the other end cap being 'formed with an outlet opening communicating withv the expansion chamber on the other Sideotthe imperforate'ange,

.and 'detachable fastening ,means :b etweeirithe inner shellan'dahe opposite'rendlcap.

In a. .mufiler, .theacombination withan elongated tubular .casingand removablefend caps therefor, .otfan :innershell extending longitudinally ,through .the `casingfaniihper- `inanently connected to one of .the endrcaps so as to be removable therewith, a series .of

longitudinal angcs projecting., A,radially from thetubular shell'and subdiyidingthe space between-the outer casingflandrinner shell :into 4a series of :longitudinal expansion cl1ambers,.one ofthe flanges ibeing imperorate while the ,other Aflanges :are perforate,

and the shell 'beings formed with i o p eningsestablishing communication betweenth'e :inf terior of theshellandthe expansioncham- :ber on one sideiof th'e imperirateflangg. .the end .cap `to which .theshellfis attachedV being formed with a central .inlet opening.

.leading to the interior ofthe ,shella transverse walllextending. across `the opposite end of the shell .and permanently connected thereto, and a Afasteninganl'einher detachably connecting ythe saidtransverse wallto .the other end cap for-`liolding the ,partsin...an

assembledposition, said .otherend cap, being. formed with-an outlet openingommimmatf ing withx the expansion c ianiberiontheopposite side of' the 'imperforate -flange.

In testimony whereof Illiave signed ,my

naine to this specification in .thepresence of two subscribing witnesses. v

RB'ERT BROWVN.- lVitnesses KNIGHT HAGERR, JOSEPH S. 'MCCA'RRICIL 

